665550555 has 8 divisors (see below), whose sum is σ = 1064880912. Its totient is φ = 354960288.

The previous prime is 665550553. The next prime is 665550559. The reversal of 665550555 is 555055566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665550555 - 2¹ = 665550553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665550553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22185004 + ... + 22185033.

It is an arithmetic number, because the mean of its divisors is an integer number (133110114).

Almost surely, 2^665550555 is an apocalyptic number.

665550555 is a deficient number, since it is larger than the sum of its proper divisors (399330357).

665550555 is a wasteful number, since it uses less digits than its factorization.

665550555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44370045.

The product of its (nonzero) digits is 562500, while the sum is 42.

The square root of 665550555 is about 25798.2665115314. The cubic root of 665550555 is about 873.0926857528.

The spelling of 665550555 in words is "six hundred sixty-five million, five hundred fifty thousand, five hundred fifty-five".